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General Procedure for the N-Substitution of Aporphines Apocodeine base (2.92 mmol) and Na2WO4 (300 mg, 1.02 mmol) was dissolved in H2O-l,4-dioxane (1:2, 10 mL) and cooled to 0 °C for the dropwise addition of H2O2 30% w/v, 12 mmol, The reaction mixture was stirred at r.t. for 3.5 h. The excess H2O 2 was quenched by addition of small portions of MnO2 at 0 °C and the presence of the peroxide determined by KI-starch paper. The reaction mixture, containing some overoxidized product as dark precipitation, was then vacuum filtered through a short pad of Celite. Solvent was removed in vacuo to give the crude product as a pale brown solid. It was immediately turned into hydrochloride salt by dissolving in a few drops of CHCl3 and dropping some EtOH sat. with HCl gas. After filtration, the mixture of minor apocodeine-HCl and major apocodeine N-oxide-HCl was dissolved in MeOH
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3), 53.71 (C6a),43.56(C5), 37.18 (C7), 26.66 (C4). (-)-(R)-N-Propyl-2-bromonorapocodeine (44) and (-)-(R)-N-propyl-2-bromonorapomorphine (10) are characterized in ref. 16a.
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